March 29, 2007

Exchange 2003 & 5.5 DST Patches

Filed under: Exchange 2003 — wansend @ 8:38 pm

All mail servers have been patched with the latest DST changes.  Workstations, however, are having a problem with calendar appointments being off by an hour for the rest of March. This Outlook 2000/2003 problem has a patch.

Description of problem:
Patch: tzmove.exe
Warning 1: Must already have XP/2000 DST patch for this to work (current updates)
Warning 2: Must be logged-in as an Administrator

I’ve fixed the Exchange 5.5 server on Windows 2000 Daylight Savings issue by updating it’s registry as described in

Step 1: Unzip onto a Windows 2000 PC. You must be an Administrator.
Step 2: Import global registry changes by right-clicking on Tzupdate.reg –> merge
Step 3: Run refreshTZinfo.vbs to apply the registry change locally. The script does not run verbosely.
Step 4: Verify with Regedit \HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation
DaylightStart REG_BINARY 00 00 04 00 01 00… should now be 00 00 03 00 02 00…
StandardStart REG_BINARY 00 00 0a 00 05 00… should now be 00 00 0b 00 01 00…
Check that the new numbers are on the PC.  These numbers are specific to Pacific Standard Time.

I tried running the Mail third DST patch, but it is already installed with Exchange SP2.  Here’s a guide that outlines all the patches:

Apparently there is a calendar bug with calendar events created a long time ago.  Each old recurring calendar event needs to be reset to a more current date for the new daylight savings time to work properly.


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